.bocadillo {
    /*display:none;*/
    width: 180px;
    margin: 20px;
    padding: 10px;
    position: relative;
    border-radius: 8px 8px 8px 8px;
    background: whitesmoke;
    color: red;
    font-size: 12px;
    text-align: center;
    /*overflow: hidden;*/
    left: 375px;
  
}

.bocadillo:after {
    content: "";
    position: absolute;
    top: 8px;
    left: -40px;
    border-bottom: 8px solid transparent;
    border-left: 20px solid transparent;
    border-right: 20px solid whitesmoke;
    border-top: 8px solid whitesmoke;
}